\"\"

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Given equations are,

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\"\" ----------------(1)

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\"\"---------(2)

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The first equation is  solved for y,

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\"\"                         (First equation)

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\"\"             (Add y to each side)

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\"\"                   (Apply additive inverse property: \"\")

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\"\"                          (Apply additive identity property: \"\")

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\"\"               (Subtract 6 from each side)

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\"\"               (Apply commutative property: \"\")

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\"\"                     (Apply additive inverse property: \"\")

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\"\"                            (Apply additive identity property: \"\")\"\"

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Substitute \"\" for y in the second equation.  

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\"\"                   (Second equation)

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\"\"       (Substitute  \"\")

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According distributive property: distribute -3

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\"\"

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\"\"           (Multiply: \"\")

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This statement is identity, such as \"\".

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There are infinite number solutions.

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\"system

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\"\"

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There are infinite number solutions.